In the more than five billion years since the beginning of the formation of the earth, countless life on the earth has changed from generation to generation, life has continuously evolved, and life and life have competed with each other and eliminated each other. Imagine the earth as early as the Middle Ages, the entire surface is still immersed in a vast ocean, and it is the abundant water source and abundant sunlight that have bred such a colorful life on the earth.
We all know that according to Darwin's "Evolution" writings, the ancestors of all life on earth should have originated from the sea at the earliest. But even today, there are all kinds of creatures in the sea that we don't know about. The deeper we look into the sea, the more we perceive the beauty of life.
Today, the vast sea still has parts that we humans cannot detect. But in these unexplorable locations, many deep-sea creatures swim without stress under extremely high water pressures. These deep-sea creatures did not choose to evolve in the direction of being able to survive on land, but chose to continue to survive on the seabed where the sky is not seen, and some of them still retain the characteristics and habits of primitive organisms, and silently entrenched in the stable ecosystem of the seabed.
<h1 class="pgc-h-arrow-right" >What is the squid? </h1>
Those who know the cuisine may have heard of the "foie gras in the sea" - that is, the liver of the sturgeon. The sturgeon we are going to mention today is a relatively well-known deep-sea fish. Even if you have not tasted the liver of the sturgeon, I believe that many people have a certain understanding of the sturgeon when playing some ancient games with fish ecosystem themes - the ugly face of the sturgeon, with raised eyes and vicious teeth, and a small lantern on the top of the head of the sturgeon is one of the biggest characteristics of the trout.
Old man fish, toad fish, ugly women, and other common names are specially "customized" for sturgeon. From these descriptions, we can see that people have never had a good impression of ugly-looking trout, but it is not a matter of a day or two that the sturgeon appears in people's field of vision.
Sturgeon can indeed be regarded as a delicious delicacy on some people's tables, although the face is ugly, but the sturgeon is a veritable "dead house fish": as an offshore demersal fish, the sturgeon is usually not as active as other fish. Because it inhabits the seabed all year round, the sturgeon has grown a body of lazy flesh, its skin is loose and soft, and there is no scale on the whole body.
Although the appearance of the sturgeon is extremely ugly, its movement function is very backward, for many underwater creatures, the usually immobile sturgeon is basically not a threat to them. The daily life of the squid is to lurk motionless on the bottom of the sea, and when it occasionally needs to move, it can only use its short front fins to prop up its bulky body to try to crawl on the bottom of the sea.
Many people want to ask at this time, since the sturgeon is so unmovable, but it is a veritable carnivorous fish, how should it forage? Here is the focus of our day - although the sturgeon is a dead house fish that does not hunt, but the dead house has a way to make a living in the dead house, the squid generally does not actively hunt, but waits for the prey to "deliver to the door".
<h1 class="pgc-h-arrow-right" what is the use of the lantern on the head of the > trout? </h1>
After talking about the general characteristics of the sturgeon, we are going to talk about the unique little lantern above its head. In the evolution of tens of thousands of years, the genes of species have chosen the development trajectory that is most suitable for a certain species according to natural conditions and can allow the species to survive smoothly in nature. In order to adapt to the huge water pressure on the seabed and the body that is not suitable for hunting at all, the trout has evolved and developed a set of hunting methods that are very suitable for themselves.
In short, the small lantern on the top of the sturgeon is its hunting tool.
When we fish, we usually use fishing gear such as fishing rods, and at the tip of the hook, we will put some bait on it, throw it into the water, and wait for the hungry fish to eat and be hooked. It is well known that many fish are unable to discern whether there is a "trap" hidden in their food, especially for bait on the hook, and especially for the lantern on the top of the head of the sturgeon.
The "lantern" on the head of the sturgeon is simply the bait used by the trout for predation. This kind of thing has a scientific name in academia called "pseudo-bait", which means false bait. Although the bait on the head of the squid is not as tempting to hunt some small fish and shrimp in the deep sea, in the deep sea, many small shrimp and fish are phototropic.
The squid, on the other hand, coincidentally evolved this small lantern that can emit light. Because the body is too thick and lives in the offshore bottom layer with huge water pressure, there is generally not much movement such as hunting, and instead, the squid usually uses its two front fins to cut through the sand and bury itself in the soil near the seafloor to hide its shape.
After being completely concealed, the lantern on the head of the sturgeon is hung alone outside. By cooperating with a special microorganism, the bait of the sturgeon can "glow" on its own, playing a role in luring small fish and shrimp. While luring prey with bait, the sturgeon will not let down its vigilance, although quietly buried in the soil to hide, but the squid will use to observe the surrounding movements, not missing a prey that can be caught.
<h1 class="pgc-h-arrow-right" > how does the bait of the trout glow? </h1>
Different trout have different baits, some of which may not glow, some of which are long and short, large and small, but without exception, all of them are used to provide hunting techniques for the trout.
The bait on the top of the squid's head is actually a little different from the real "overhead", and this rod-like bait is actually a front dorsal fin of the squid. Although there is not a single piece of scale on the body of the sturgeon, the function of the dorsal fin is still very complete. In the long period of survival and evolution, the sturgeon chose the closest to the mouth from the countless dorsal fins, and evolved into a fishing rod that can now shine, that is, this kind of bait.
The baits of the squid usually have special constructions. Some trouts that cannot emit light from the bait will also flexibly use the swing bait to attract the attention of small fish and other prey. The main reason why the bait of the bait can emit light is that there are special glandular cells inside the bait, and the squid can secrete luminescent through the glands, so that the microorganisms living inside the bait react with oxygen, resulting in a weak light.
Even a faint light is enough to provide the conditions for the trout to hunt small fish. Although the sturgeon living in the dark underwater world does not have the ability to hunt smartly, this small lantern alone can also provide such a dead house fish to eat for a lifetime. By hunting small fish and shrimp by the glow and shaking of the bait, and then seizing the opportunity to open the "blood basin mouth", you can smoothly suck the prey into the mouth and eat a full meal.
Incidentally, the mackerel with this mature hunting technique is basically a female, and the female sturgeon has a strong body and sharp teeth, while the male sturgeon does not have such a significant feature. Usually, the ones who can trap prey using bait are usually female sturgeon.
Relatively small, insignificant males generally can only survive by parasitizing the body of female sturgeon. Despite its ugly appearance, the sturgeon is a delicacy on people's tables today.